So I'm not a developer or anything, just an enthusiast.
I was wondering something.

ROMs often don't get updated because support of the chipset has been dropped. I'm guessing this is like a driver?
If it's the same hardware, why does it need a new one? What changes in each new version of Android that means it needs a new one?

Also for those that have lost support, some devs still make ROMs. How? Do they make one themselves somehow?

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